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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        function Star(uname, age) {
            this.uname = uname;
            this.age = age;
        }
        Star.prototype.sing = function () {
            console.log('我会唱歌');
        }
        var ldh = new Star('刘德华', 18);
        var zxy = new Star('张学友', 19);
        ldh.sing(); //我会唱歌
        zxy.sing(); //我会唱歌
        console.dir(Star); //prototype
        console.log(ldh) //__proto__

        console.log(ldh.__proto__ === Star.prototype);//true


        //constructor:
        console.log(Star.prototype)        
        console.log(ldh.__proto__)
        //
        console.log(Star.prototype.constructor) 
        console.log(ldh.__proto__.constructor)


        Star.prototype = {
            //如果我们修改了原来的原型对象,给原型对象赋值的是一个对象(因为=号重写了prototype里的所有东西),则必须手动的利用 constructor指回原来的构造函数
            constructor: Star,
            
            sing: function() {
                console.log('我会唱歌');
            },
            movie: function() {
                console.log('我会演电影');
            }
        }

    </script>
</body>

</html>